THE DECREASE OF THE GEOMAGNETIC FIELD MAGNITUDE DURING SSC EVENT

On the basis of solar wind data from the WIND satellite, magnetic field data from GOES satellite and ground-based magnetic data the influence of secondary rarefaction wave on the geomagnetic field is examined. This secondary rarefaction wave is arising in the magnetosheath during the interaction of interplanetary shock wave with the bow shock-magnetopause system. The secondary rarefaction wave decreases the magnitude of the magnetic field during SSC.